Dimensions*
M6 ~ 6.4mm i/d ~ 12mm o/d ~ 1.6mm thick
M8 ~ 8.4mm i/d ~ 16mm o/d ~ 1.6mm thick
M10 ~ 10.5mm i/d ~ 20mm o/d ~ 2mm thick
M12 ~ 13mm i/d ~ 24mm o/d ~ 2.5mm thick
M14 ~ 15mm i/d ~ 28mm o/d ~ 2.5mm thick
M16 ~ 17mm i/d ~ 30mm o/d ~ 3mm thick
M18 ~ 19mm i/d ~ 34mm o/d ~ 3mm thick
M20 ~ 21mm i/d ~ 37mm o/d ~ 3mm thick
M22 ~ 23mm i/d ~ 39mm o/d ~ 3mm thick
M24 ~ 25mm i/d ~ 44mm o/d ~ 4mm thick
M27 ~ 28mm i/d ~ 50mm o/d ~ 4mm thick
M30 ~ 31mm i/d ~ 56mm o/d ~ 4mm thick
*Subject to manufacturing tolerances